package com.csyf.manager.channel.nmpay;

import java.security.MessageDigest;

public class SHAUtil {

	private final static String[] hexDigits = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d",
			"e", "f" };

	private static String byteArrayToHexString(byte[] b) {
		StringBuilder resultSb = new StringBuilder(64);
		for (byte aB : b) {
			resultSb.append(byteToHexString(aB));
		}
		return resultSb.toString();
	}

	private static String byteToHexString(byte b) {
		int n = b;
		if (n < 0) {
			n = 256 + n;
		}
		int d1 = n / 16;
		int d2 = n % 16;
		return hexDigits[d1] + hexDigits[d2];
	}

	public static String SHA1Encode(String origin, String enc) throws Exception {
		String resultString = null;
		MessageDigest md = MessageDigest.getInstance("SHA1");
		resultString = byteArrayToHexString(md.digest(origin.getBytes(enc)));
		return resultString;
	}

}
